Variable: comint-ptyp
comint-ptyp is a buffer-local variable defined in comint.el.gz.
Documentation
Non-nil if communications via pty; false if by pipe. Buffer local.
This is to work around a bug in Emacs process signaling.
Source Code
;; Defined in /usr/src/emacs/lisp/comint.el.gz
;; Fixme: Is this still relevant?
(defvar-local comint-ptyp t
;; FIXME: What bug and how does this work around that bug?
"Non-nil if communications via pty; false if by pipe. Buffer local.
This is to work around a bug in Emacs process signaling.")